Brief high idle.
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Freshman User
Joined: Sep 2016
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Brief high idle.
Is this normal? The idle stays up then goes a few seconds after I give it throttle. The solenoid holds the idle up then releases. I just rebuild the carb but it did the same thing before. I also replaced all the plug caps and vac tested lines. Also checked the intake manifold for air leaks. New carb base gaskets also.
The truck is in operating temperature and was driven 20 minutes.
I'm gonna smog soon and don't know if this is normal or will affect smog.
86-87" 300 carter yfa emissions regulated.
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The truck is in operating temperature and was driven 20 minutes.
I'm gonna smog soon and don't know if this is normal or will affect smog.
86-87" 300 carter yfa emissions regulated.
Watch in full screen view and click options to watch in higher resolution.
Moderator
Joined: Jan 2001
Posts: 56,980
Likes: 2,735
From: Virginia
Your truck has a computer on it, and I think it has a electronic throttle positioner on the carb doesn't it? That is probably normal for it. Letting the throttle suddenly close shut creates high emissions, so they are probably bringing it down slowly to prevent that. I know the efi trucks do the same thing.
Elder User
Joined: Nov 2013
Posts: 524
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From: Maryland
The only thing I remember being computer controlled on the '86 is the main jet, but I could certainly be wrong. Your idle also seems very high, it should be around 6-700. If your idle is computer controlled, the solenoid may be sticking, causing both the high and sticking idle
Moderator
Joined: Jan 2001
Posts: 56,980
Likes: 2,735
From: Virginia
The only thing I remember being computer controlled on the '86 is the main jet, but I could certainly be wrong. Your idle also seems very high, it should be around 6-700. If your idle is computer controlled, the solenoid may be sticking, causing both the high and sticking idle
Electronic Engine Control - ???Gary's Garagemahal
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
What is your 'Build Date"?
Have you check your codes to see if your Emission systems are effecting your idle ?
Have you check your codes to see if your Emission systems are effecting your idle ?
Last edited by vjsimone; Apr 14, 2017 at 09:02 AM. Reason: Adding Text
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